Error lsqcurvefit using Function value and YDATA sizes are not equal.

Question

Titas Deb 2019-8-29

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https://ww2.mathworks.cn/matlabcentral/answers/478151-error-lsqcurvefit-using-function-value-and-ydata-sizes-are-not-equal

评论： Star Strider 2019-8-29

采纳的回答： Star Strider

ydata = [4.83 3.87 2.54 2.08 1.82 1.8 1.76 1.74];

xdata = [5 10 20 30 45 60 90 120];

fun2 = @(x,xdata)((42*exp((13/7)*x(1)*xdata))-140)/(10+(10* exp((13/7)*x(1)*xdata)));

x0 = [-1,1];

x = lsqcurvefit(fun2,x0,xdata,ydata)

I got the error message:

Error using lsqcurvefit (line 262)

Function value and YDATA sizes are not equal.

Error in dimethyl_kinetics2 (line 43)

x = lsqcurvefit(fun2,x0,xdata,ydata)

size(ydata)

size(fun2(x0,xdata))

ans =

1 8

ans =

1 1

I get that they need to be the same. But how do I do that?

Thanks a lot.

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Answer 1

Star Strider 2019-8-29

1
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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/478151-error-lsqcurvefit-using-function-value-and-ydata-sizes-are-not-equal#answer_389683

在 MATLAB Online 中打开

You need to do element-wise division:

fun2 = @(x,xdata)((42*exp((13/7)*x(1)*xdata))-140)./(10+(10* exp((13/7)*x(1)*xdata)));
                                                  ↑

With that change, your code works.

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Titas Deb 2019-8-29

Thanks so much. It works now.

Star Strider 2019-8-29

As always, my pleasure!

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